docs: def list_items(self, package_keyname, **kwargs):
          """List the items for the given package.
  
          :param str package_keyname: The package for which to get the items.
          :returns: List of items in the package
  
          """
          get_kwargs = {}
          get_kwargs['mask'] = kwargs.get('mask', ITEM_MASK)
  
          if 'filter' in kwargs:
              get_kwargs['filter'] = kwargs['filter']
  
          package = self.get_package_by_key(package_keyname, mask='id')
          items = self.package_svc.getItems(id=package['id'], **get_kwargs)
          return items